Superheater for boilers



Patented Aug. 7, 1928.

1,679,585 UNITED STATES PATENT OFFICE.

RUDOLF M. OSTERMANN, OF EVANSTON, ILLINOIS, AS SIGNOR TO THE SUPERHEATER COMPANY, OF NEW YORK, N. Y.,

A CORPORATION OF DELAWARE.

SUPERHEATER FOR BOILERS.

Application filed June 28, 1924. Serial No. 722,890.

My invention relates to superheater arrangements for boilers, and has for its object to provide an improved structure for the better utilization of the heat of the combustion gases, both by convection and radiation, for the superheating of the steam generated .in the boiler. According to my present invention, superheater elements or tubes are placed at the hottest portion of the boiler, yet clear of the path of the combustion gases, so that these superheater elements will be heated chiefly, if not exclusively, by radia tion. Another feature of the invention relates to protecting the boiler tubes against injury by the hot gases, the latter being led through a path which brings them incontact with one portion of each of the boiler tubes, and subsequently with other portions of said tubes. Additional features and .advantages of this invention will appear from the detailed description following hereinafter.

A typical example of my invention is illustrated in the accompanying drawing, in which Fig. 1 is a Vertical section through a boiler provided with a superheater arrangement embodying the present improvements, and Fig. 2 is a section on line 2-2 of Fig. 1. a

At 1 and 2 I have indicated the front and the rear wall respectively of the combustion chamber 3, and above them the headers 4, 5 connected by the inclined tubes 6, and a drum 7 communicating with said headers by pipes 8 and 9 respectively. These parts may be of well-known construction.

An upright transverse baffle 10 extends from the lowermost tubes 6 to the uppermost ones, and from this bafile an inclined baffle 11 extends longitudinally of the tubes 6 forwardly to the header 1, above the lowermost row of tubes 6. In the pocket formed by these two bafiies and the header 4 between the two lower rows of tubes 6, are disposed transverse superheater tubes 12 connected with headers 13 and 14 respectively one of which, 13 is adapted. to deliver superheated steam to the engine (not shown), while the other, 14, receives steam, through a pipe 15, from the outlet header 16 of a superheater 17 located in the space between the drum- 7 and the uppermost tubes 6. The inlet header 18 of the superheater 17 isconnected with the steam space of the drum 7 by a pipe 19. From a point adjacent to the outlet header 16 a transverse baflle 20 extends downwardly between the front header 4 and the baflle 10 and terminates short of the longitudinal baffle '11. An inclined transverse baffle 21 extends upwardly from the upper end of the baffle 20. These various b'afiies, in conjunction with the walls 22, 23, of the boiler setting, provide a sinuous path for the combustion gases from the chamber 3 to the outlet or stack connection 24. This path comprises an ascending ortion 25 located at the upper portions 0 all the inclined tubes 6 and preferably, as shown, this ascending portion is constructed upwardly to obtain an approximately constant velocity of flow notwithstanding the reduction in the volume of the gases which results from their gradual cooling. The gases then travel forwardly in the path portion 26, along the tubes of the superheater the forward portions of the lower tubes 6 (except those of the lowermost row), forwardly and downwardly above the inclined longitudinal baffle 11. Finally, the gases again pass upwardly in the ascendin path portion 29 which is located forwar ly of the transverse baflles 20 and 21, so as to heat the forward or lowermost portions of the. I

upper tubes 6.

It will be noted that the superheater tubes 12 are located to one side of the above described path of the combustion gases. These v tubes therefore receive but little heat from said gases by direct contact or convection, but are heated chiefly by radiation. It will also be observed that those portions of the tubes 6 which lie in the portions 27, 28, and 29 of the path of the combustion gases are shielded, by the battles 10, 11 andby the sup'erheater tubes 12,'from the/direct action of the hottest gases. The'utilization of the heat of the gases is very eflicient, both with respect to the boilertubes 6 and the superheater tubes 12 and 17. The hottest gases are brought into heat exchange relation with the hot water at the upper end of the inclined tubes 6.

Various modifications may be made without departing from the nature of my invention as set forth in the appended claims.

I claim:

1. In combination with a boiler furnace and a boiler having inclined tubes set above said furnace at dilferent levels, an upright battle extending upwardly across said tubes, a longitudinal bafile extending from the first-mentioned battle above i the bottom thereof forwardly and downwardly at an inclination corresponding to that of said tubes and forming with said longitudinal battle a closed pocket out of the path of the furnace gases but exposed to the radiant heat from said furnace, and a superheater located in the pocket below said inclined baflie and in advance of said upright battle.

2. In combination with a boiler furnace and a boiler having inclined tubes set above said furnace at different levels, an upright baffle extending upwardly across said tubes, a longitudinalbaflie extending from the firstmentioned baflle above the bottom thereof forwardly and downwardly at an inclination corresponding to that of said tubes and forming with said longitudinal baffle a closed pocket out of the path of the furnace gases but exposed to the radiant heat from said furnace, a depending bafile extending across the upper portions of said tubes above, and to within a distance from, said inclined bafiie, means for forminga path connecting the upper ends of the upright channels at each side of said upright baflle, a superheater located in said connecting path, and another superheater, connected With the first-mentioned superheater, and located in the pocket below said inclined bafile and in advance of said upright baffle.

3. In combination with a boiler furnace and a boiler having tubes set above said furnace at different levels, an upright bafiie extending upwardly across said tubes, a longitudinal baifie extending from first-mentioned bafile forwardly at'a point above the lower end of said upright baffle, to form be low said longitudinal bafile a pocket located to one side of the path of the hot gases, and a super-heater located in such pocket.

4. In combination with a boiler furnace and a boiler having tubes, a baflie extending across said tubes between said tubes and said furnace and'means to compel the gases from the furnace to pass directly only on the side of said bafile farthest from the furnace, and a superheater located on the other side of said bafile,

In testimony whereof I have hereunto set my hand.

RUDGLF M. OSTERMANN. 

